Openpump

Building the syringe pumpIn this guide you'll learn how to build the linear actuator designed by Michigan University's Open

Sustainability Technology Lab (MOST).

Written By: Gerrit Niezen

Building the syringe pump Draft: 2014-12-16Guide ID: 2 -

This document was generated on 2019-10-23 01:24:12 PM (MST).

© 2019 openpump.dozuki.com/ Page 1 of 8

INTRODUCTION

The mechanical part of the pump that drives the syringe is called a linear actuator, and the MOSTresearch group designed one made from mostly 3D-printed parts.

This guide contains the step-by-step instructions for building your own linear actuator.

TOOLS:Allen key (1)

2.5mmDrill bits (3)

3mm, 5mm and 6mmUtility knife (1)

PARTS:Smooth rod (2)

6mmThreaded rod (1)

M5Cut to same length as your smooth rods

Linear bearings (2)LM6UU

M5 Nut (1)Ball bearings (2)

625ZZ5x16x5 mm

Stepper motor (1)NEMA 17

Allen bolt cap screws and nuts (14)M38mm x 4, 10mm x 2, 16mm x 4, 40mm x 4

Flexible coupling (1)M5

Building the syringe pump Draft: 2014-12-16Guide ID: 2 -

This document was generated on 2019-10-23 01:24:12 PM (MST).

© 2019 openpump.dozuki.com/ Page 2 of 8

Step 1 — Building the syringe pump

Clean the 3D printed holes using3mm, 5mm and 6mm drill bits.

Step 2

Use two M3 8mm bolts and nuts toclamp the smooth rods into themotor end.

Building the syringe pump Draft: 2014-12-16Guide ID: 2 -

This document was generated on 2019-10-23 01:24:12 PM (MST).

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Step 3

Insert the LM6UU linear bearingsinto the syringe carriage, aftercutting out the holes using a utilityknife.

Insert one M5 nut into the syringecarriage.

Step 4

Use two M3 10mm bolts and nuts toattach the syringe plunger retainer tothe syringe carriage.

Building the syringe pump Draft: 2014-12-16Guide ID: 2 -

This document was generated on 2019-10-23 01:24:12 PM (MST).

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Step 5

Insert and screw the threaded rodthrough the trapped M5 nut.

Step 6

Insert the two 625ZZ bearings intothe idler end.

Building the syringe pump Draft: 2014-12-16Guide ID: 2 -

This document was generated on 2019-10-23 01:24:12 PM (MST).

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Step 7

Slide the two smooth rods throughthe LM6UU linear bearings.

Step 8

Use two M3 8mm bolts and nuts toclamp the smooth rods into the idlerend. The threaded rod should slidethrough the 625ZZ bearings.

Building the syringe pump Draft: 2014-12-16Guide ID: 2 -

This document was generated on 2019-10-23 01:24:12 PM (MST).

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Step 9

Insert four M3 nuts into the syringeclamp.

Take four M3 40mm bolts andattach the syringe clamp to the idlerend.

Step 10

Use four M3 16mm screws to attachthe stepper motor to the motor end.

Building the syringe pump Draft: 2014-12-16Guide ID: 2 -

This document was generated on 2019-10-23 01:24:12 PM (MST).

© 2019 openpump.dozuki.com/ Page 7 of 8

Step 11

Attach the flexible coupling to thestepper motor and the threaded rod.

Step 12

You can now connect yourelectronics to the stepper motor.

To ensure the construction isproperly aligned and straight:

Loosen the bolts on the idler endand motor end slightly.

Slide the syringe carriage alongthe rods to align them, and thentighten the bolts one by one,sliding the syringe carriage backand forth to check alignment.(thanks to Ceri Clatworthy for thetip!)

Building the syringe pump Draft: 2014-12-16Guide ID: 2 -

This document was generated on 2019-10-23 01:24:12 PM (MST).

© 2019 openpump.dozuki.com/ Page 8 of 8